1. Longcope, W. T., and Luetscher, J. A., J. Clin. Invest., 25, 557 (1946).
2. Berlin, M. (unpublished observations).
3. Fitzsimmons, J. R., and Kozelka, F. L., J. Pharmacol., 98, 8 (1950).
4. Berlin, M., and Ullberg, S. (in the press).
5. Ullberg, S., Acta radiol., Supp. No. 118 (1954); Proc. Sec. U.N. Intern. Conf. Peaceful Use Atomic Energy, 24, 248 (1958).